import re
s = '''rates[ 'inner' ][ 'Находка' ].HKD = {
buy: '80,30',
buy_arrow: '1',
sale: '81,00',
sale_arrow: '-1'
};'''
m = re.search(r'(?sm)=\s*{(.*?)};\s*$', s)
if m:
print(m.group(1))
aW1wb3J0IHJlCnMgPSAnJydyYXRlc1sgJ2lubmVyJyBdWyAn0J3QsNGF0L7QtNC60LAnIF0uSEtEID0gewoJYnV5OiAnODAsMzAnLAoJYnV5X2Fycm93OiAnMScsCglzYWxlOiAnODEsMDAnLAoJc2FsZV9hcnJvdzogJy0xJwp9OycnJwoKbSA9IHJlLnNlYXJjaChyJyg/c20pPVxzKnsoLio/KX07XHMqJCcsIHMpCmlmIG06CiAgICBwcmludChtLmdyb3VwKDEpKQ==