SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a2d2d3c26f43531d4ad7c5ea543a946f7278bea777f561d0272046ef689fe72f' 
  AND token = 'my2geEVPqJEzbBWYs6kmvESwLJa51LGkHrf2VlKK+yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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