SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '554e2f8fc63963e21a95eaa9100263b56f5576d73abeb1d1b94ec2fb2564fb1f' 
  AND token = 'HXcBIfYOhkYsP4Oo6+3UGCsjHv1VrCkh83StfNHQHgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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