Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ed4c54e2d0f525c015286a6c8a4b8b4ac9b60746db2e2f224bffe0dfb39704' 
  AND token = 'lqRl5vBoGlWATxaXMxp2r6LzXgCkKl1D3WthetZAVRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}