Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b68913caa7d0712555efe6e67b7d132beef0e20432b64f815d2bf0787931749' 
  AND token = 'uEeMVyV9Q3rq+h9ccLXhq+HTvy9Qh49STHfxnF+RwH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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