SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fe45f6a7714aac47200537dc2959ca99575dc6518934b47b946f8488280d72b3' 
  AND token = '0DvBZoI5SJOulVo7BMWAm2AoyaCsqNzIipH9h+1wm5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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