Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6229c37c81c8f11a43765998aec1243b8264273b3d74bdcc3c621d406212e0de' 
  AND token = '2w8Bd2Vr3AzAwbJUMVN2TPOvRDcJxZKjZuWdxMo96fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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