Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d8e4f51d04f89dda7dde0a461074c37218a21cd707d18e89e749d449f34c3d' 
  AND token = 'oOixo8QSg0h8CBrOEr6VRmZ4PRaasnSUmbPSDMkCLlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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