Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ce52a6ae18b54f72204b76f6051e3c6376cbdf1c2f4b594aade52d69b337ba' 
  AND token = '15lhXdnctLOJc/dsavHaFJdcOcd4SanqImbBbZrq6BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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