The ornamental design for a keywayportion, as shown and described.
FIG. 1 is a perspective view taken from a bottom, front, right side of a keyway portion;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a perspective view taken from a top, front, right side thereof shown on a connector where the keyway portion is part of a female keyway of the connector; and,
FIG. 4 is a perspective view taken from a top, rear, left side thereof shown on a connector where the keyway portion is part of a male keyway of the connector.
The dashed lines in the figures illustrate the portions of the design that form no part of the claimed design.