Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebc9e7004c9120c658f20cb2c54d7ce568be15e7bb4f6e53b4913f937519cb3' 
  AND token = 'EHTAZILzAo8zz38u9A5zNd0TJnX0GyrPDeigs8MCM0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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