Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8d30056fcbbd2890b19bf8d37129d379ea6e63919721dba4641dcb8103c384' 
  AND token = '6VgttUxuJ60brbbt31Ky57bjt8N5izHQgDOebawUX8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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