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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b10bf04645b41594b0fd5f5dafcff10d59e5ffbd4a91da496118445e3b6df7e8' 
  AND token = 'GaFiNOPQLhPtV/w1OqdN1jSMy3U9aO885owjE7nffEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}