SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a72ff21501427c4254739a3c16fdbe9ce28d7666532de960d4e5208009974a3d' 
  AND token = 'GU1NDbwttWUk7+aLqHlzzNmPhipMk/evl0hlNEQwYWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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