SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '84d7dd1216328ee6556adfd9da56905c8cdc4f122a404b59ed5c6c97a4d492cf' 
  AND token = 'CxFpeu/YJ74Wh7GoOhmRw4z9vviunHxLbxDwB8/usYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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