Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9e5c86de5da29a9d5e1127728d38d132e528c92d9d1490a16f2825c3304d58' 
  AND token = 'RGnztyaQnYv8ftN+TwW81PPOhdjy9MpwiWP8P6OE7ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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