SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9d8123751c35857e4cf8947d3c351783eefdc7b0713898e7adbebdef0871a2bb' 
  AND token = 'DUrKxLItNovWgZ9S4T2ZZPJKmjwHdCExPddpbY5nBY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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