Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48aaa7b18449fee70db4badf3edbeadbf2b5e28e5cd746d56dfbfddd20429c40' 
  AND token = '3v6mwiDRKinj4qzfk9/6rLtJuj2X8E8ZIsMWXZX+fjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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