SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0f6d9d633b8f8bb6198e127fdda2aaa0736cdaaee4c75c0926979ff5fb0c2f45' 
  AND token = 'h81X8GN4GNq7UxCstvHbw2X7PZHKpGlBNo3GtIItudM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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