Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9f7e7c60b9c152ddaad3367b7c385e30dce8d10c16c6ad07df35ed0fe60477' 
  AND token = 'j94FDhjDEwmUuLc4lKeyRQPm7SCmN0vVQtpPyyFAD8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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