Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bef21f1bdc0160bdd7edefd56f2b0405f68f8d775e2cb24a14c037d5ec6ff6' 
  AND token = 'QYBnuKNlGKx7BeznlSzCnhWG0pF5t1HJ3saf7if2BP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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