GST on scrap sale and registration

We have not registered under GST since we provide Healthcare service and exempt from GST. Our total turnover is 20 crore in last year. During the current year we have sold scrap of Rs.25000/- and as per my understanding we will have to register under GST since it is a taxable supply. However since we don't have any other taxable supply, is there any way out that we don't have to register under GST?