Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167fadef7dce8e3cfa505f7af0a5a710264ee6df54a3bb467a9c1590c5988cc6' 
  AND token = '3OLi9VR49EXtLi1WVzmhxaFr1+meKMvW/aE9jilaB7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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