Build a MultiIndex from date and ticker, then select the row identified by date == "2020-01-01" and ticker == "GOOGL", restricted to the columns from open through close inclusive (in their original column order).

Sample data: df:

         date ticker  open  close
0  2020-01-01   AAPL    95    100
1  2020-01-01  GOOGL   190    200
2  2020-01-02   AAPL    99    101