SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67aa91abfa890dca495d9817e92835aa40e25726fb96d6d8ae1de3f787dd44d3' 
  AND token = 'gI6i9Y8WO/CH6PKHlf/30ZLKGb3cGILVSnZG0o0nwJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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