SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'dcdc482318b7b618411cc0b59abb742c141e3024b036da4306ced925468bac8f' 
  AND token = '+lPpnP5V/jsGHYgGGPjBYD4QHTPMNOMG6/UekwmY4fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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