Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50385c006ccb63513c7fd7dcb3a22288c25db79cfebc155a9f6056cf45b3257f' 
  AND token = 'CGWaBjUwetveEQCNyDFlN7r5zfE5ZaQzJwIFecznGGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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