Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c4a08dceca9663a52fc96023082792e689f5a351347aceb867b34726aae0ac' 
  AND token = 'baE8zLbXFBEtcjSmmzAd8SEfHOCX2TdPDk/z4Ybv8bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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