Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461756096fe10512c2447c6c922ad689b1df1b5a75aab92697d8020e5bc6e1ec' 
  AND token = 'DcJPwtLtLZFxGdCbSAmOn49wOysL3WQFbgDs1fRwD7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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