Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79ab94abbad8981d4dc92979b46c11564cf250e4502c4621af70fed97412194' 
  AND token = 'WPer4vPwcdOhvglATDqotwcRlGixCFlFqg76QL2WODY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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