Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859691d6b6f1bdc7a8f1ebe40251e95619d2f4fcf7e71dad733542ebd7f96435' 
  AND token = 'sbLxmn89wMvbmqxLYZ4zAf6ZFmNHnROKrCHbcGYxRtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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