SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '143cfe2fb9c546ef48e4bfb979811af390a4ce59d64712ab09de87a8812c5798' 
  AND token = 'GULYGRgtKSmaz7/XEbO/a2kQ5t+HnlTVIsqGQ5EKZi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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