SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '17322d0b8090e96b61d943fd9316e2daf70c38ddb5cbb9a337feb873f78edd64' 
  AND token = 'qJCQLtYkL+FTbfyOUQ6M2YsybZKKEszHodQeIIYw/Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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