Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ad92a1fa62cfb33e3177e6792a24a3e36c6100bedc22ffd98dc216a3c81df0' 
  AND token = 'LNuDXCt4Vu+TpSVJKv2SQjlP5kzyneVCqgOkGjJafnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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