Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312072648e05573d63e3b6f61fb7c259c39462784dc7f11e67458194dcb532f6' 
  AND token = '6kImG9HqY8rTRuV08v+39QhsOjiJa6Db6m8uihy/d0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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