from io import StringIO
import pandas as pd
df = pd.read_csv(StringIO(
"""timestamp,dummy1,dummy2
2014-05-01 09:31:00+00:00,1,3
2014-05-01 09:32:00+00:00,2,4
"""
), parse_dates=['timestamp'])
# use a multi index
df = df.set_index(['timestamp', 'dummy1'])
dummy2
timestamp dummy1
2014-05-01 09:31:00+00:00 1 3
2014-05-01 09:32:00+00:00 2 4
фильтр включен 2014-05-01 09:31
df.loc['2014-05-01 09:31']
dummy2
timestamp dummy1
2014-05-01 09:31:00+00:00 1 3