Question Animation imported from Maya has interpolation issues

I have imported animation from Maya (.fbx) and the curves for the animation in Unity are very different than in Maya. I can clearly notice a flicker for few seconds when I am scaling the object (0 to 1) in loop. The curve for scaling is shown below.
The rest in the animation work fine except for the scale. The problem is that Unity adds interpolation automatically to these curves which is why it creates an issue. I have selected the keys in the curves for the scale attribute and "Both Tangets -> Constant", but it did not have any effect.
How can I fix this?