Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3877ee5a364e4dedac8bf84285cc4ccf8db704e7b86bc5e35eca08d89ec488' 
  AND token = 'qH1OzFLyjIdobT77WzNHUNKNqOXvn6E+gDdjsbnzgGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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