Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30801fa403711d43c0ef28ac6a4b24620a5888ca1d7f5befe39c85339ea4427e' 
  AND token = 'U3uS+PdIF1pIiAm9I+v4Dtutp6R/eGd5TpM2RWMIW2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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