Update last_update_key when new data received

apps/explorer/lib/explorer/counters/address_transactions_counter.ex

@@ -73,10 +73,9 @@ defmodule Explorer.Counters.AddressTransactionsCounter do
   end
 
   defp update_cache(address) do
-    put_into_cache(@last_update_key, current_time())
-
     new_data = Chain.address_to_transaction_count(address)
     address_hash_string = get_address_hash_string(address)
+    put_into_cache(@last_update_key, current_time())
     put_into_cache("hash_#{address_hash_string}", new_data)
   end