SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '436aac43d75b9fbf498ebe45e4778f01615e7b7d92304dff17ff5d7782c7923a' 
  AND token = 'HzjBUWwOQyOwiP6iWPK7ZjFYZrsrYmEqD6UsyY1WP54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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