Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b670d293cbf40016c3e6e70bc82dac3ab5c54b036fdb9cdb20ce4b649f43aac' 
  AND token = 'X0nKcX6kD8uLgATmc9aMQoxeTRGsmczNqhvVEKvwohA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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