Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5bb7d11d3b06e4496dc8158e2dd87b5fc55d9492be87f0ae4ee9f960590d4c7d' 
  AND token = 'DXi8DnX6wWe1lFD3S71wUckp0MC2N0H+ZNrvXmmVGds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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