SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '14726a56d0e128a513cf52d95ba0b18b2c2b709f7047194f058e497b8593879d' 
  AND token = 'qmLU5upmUTBGjU5eJFpc555An++KYRxm3A/AVPOal6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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