Query Too Slow! Need Some Performance Enhancing Tips!

I have a stored procedure that queries a database using a Select
statement with some inner joins and conditions. With over 9 million
records it takes 1 min 36 sec to complete. This is too slow for my
requirements.

Is there any way I can optimize this query. I have thought about
using an indexed view. I haven't done one before, does anyone know if
this would have potential to improve performance or indeed any other
performance enhancing techniques I might try.

SELECT vehicle.vehicle_id
FROM (( [vehicle]
INNER JOIN [vehicle_subj_item_assn] on
vehicle.vehicle_id=[vehicle_subj_item_assn].vehicle_id)
INNER JOIN [subj_item] on
[vehicle_subj_item_assn].subj_item_id=[subj_item].subj_item_id)
INNER JOIN [template_field] on
[subj_item].subj_item_id=[template_field].subj_attr_id
WHERE
([template_field].template_field_id=@template_field_id) AND
([template_field].template_field_type_id=3) AND
([vehicle_subj_item_assn].subj_item_value_text=@value) AND
(vehicle.end_dtm IS NOT NULL)

Thanks
Gavin