Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5a9338a45c1a6c17fb8024c9ed90fcc1b5648aa51f827fb15e6dd01e0cbae7' 
  AND token = 'lTkIf7AXyvO0xcYkl4nBe395qb0Jgmjl2nW5uzcHs1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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