Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4103affb135d915d5629f8bf2338f5c3d0a0aaa6ca5a9b2ce5ed5777a64d42a8' 
  AND token = 'YDiQ8VG8f1HiZpinOB4TsL90IJw7SQ0W3BhDCZpqtaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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