Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d552c489b2cbb2439696f8be5c0794571283178deaf37df29ee1aa22681625' 
  AND token = 'ecr8Z4Lv5auTFmj5lvjvfsos/zUguTAmrS5aOnh/V08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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