Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1455d0ea4bbf736172744cc5bcb93ce6f91407bd2ca21613a651dbbb243176' 
  AND token = '3tbDI5lb1I1U6RQdiB50kcRjwU9qyJD2ADNMf/0alDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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