Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3b3bd9357ed0ebf8ca66447e91382b2fd26efd4e68b69cc7b70026ec99d1c1' 
  AND token = 'B8VWV1zIJV7fYLJs7Z7eK7vG3r4YX5Sq4fVsIbnFOY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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