Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c42d273059bfc69c0c256377e7a79cb4bf9faecdf3a519da42e6edc088afab' 
  AND token = 'mGXM0Xt1jf31Rz7S4ZM5Y6g6YoSEPA6noY7kfqjP51Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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