Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e168e1e49757061d75f2da3db2845352a316c18427c9c841b5a661b0d570376' 
  AND token = 'J6TUPSvrGQ3c7Zx4s14zlp/UiNh0JFpjzb43muQzz4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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