Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a65b773beef109df3e13d73abffd394cdcfd623cbf5df9d4447d683622ba231' 
  AND token = 'uehDZnB+pUE7oTIt6Trxtatfdhs4y9cycsYQe4YNfz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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