Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15a30daac17412f52ad07473e8bac6d2b18faeaf81fca28fa5007ca6821f5c0' 
  AND token = 'ZBKlR4MwdVWu4wRk3AaplspzrAdI8eAuJ+ZJy32fe6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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