SELECT 
  * 
FROM 
  ushop_wk_delivery_day_settings 
WHERE 
  company_id = 2 
  AND shipping_id = 0 
  AND day_disabled = 'N'

Query time 0.00035

JSON explain

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