SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'dc68ddc97a84c65093f2f54865fa9491a74900b1657be02f11f891fa2f7debab' 
  AND token = 'NzgLvZMXxpc4IpimWxtMVQz/hxbCdIWwBgVYVnp5c/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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