SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6fe58977acf3745e477c736cd027d56671e6e303b322009a737f83940ead8916' 
  AND token = 'ykyf3vJPOzOiIYD1shZtyY+YW+/HVHU3Vlf9LYBOBM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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