Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fdbe0e8d3fe129dec852f895a79801bd66ebffb19279707241c2ece05f17c6' 
  AND token = 'cDDtqhgBHNN1gYP7EHaiUe3NCMZnCZU0Zfs0mIykNJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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