SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd9836ce2eae3e063dbba71e2fd25020de04758d21b6d1a68f87dc73b247a805b' 
  AND token = 'Y5qpgZtNhx1+HKhgPMlFX8cLFlxNfCRQ5ZLtsUwX5gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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