Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b49979990fcc9289a2a3dec489dc31d7881d83bafcffc5429e7ef6990a12b2b' 
  AND token = 'QLowvgjt1/PVeuJ1ITZons8wZaqfwgc53nwmpVtXFcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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