Fix performance of coin supply API endpoints

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Features
 
 ### Fixes
+- [#3132](https://github.com/poanetwork/blockscout/pull/3132) - Fix performance of coin supply API endpoints
 - [#3130](https://github.com/poanetwork/blockscout/pull/3130) - Take into account FIRST_BLOCK for block rewards fetching
 - [#3128](https://github.com/poanetwork/blockscout/pull/3128) - Token instance metadata retriever refinement: add processing of token metadata if only image URL is passed to token URI
 - [#3126](https://github.com/poanetwork/blockscout/pull/3126) - Fetch balance only for blocks which are greater or equal block with FIRST_BLOCK number

apps/explorer/lib/explorer/chain.ex

@@ -1517,7 +1517,8 @@ defmodule Explorer.Chain do
       from(
         a0 in Address,
         select: fragment("SUM(a0.fetched_coin_balance)"),
-        where: a0.hash != ^burn_address_hash
+        where: a0.hash != ^burn_address_hash,
+        where: a0.fetched_coin_balance > 0
       )
 
     Repo.one!(query) || 0
@@ -1528,7 +1529,8 @@ defmodule Explorer.Chain do
     query =
       from(
         a0 in Address,
-        select: fragment("SUM(a0.fetched_coin_balance)")
+        select: fragment("SUM(a0.fetched_coin_balance)"),
+        where: a0.fetched_coin_balance > 0
       )
 
     Repo.one!(query) || 0