Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f5c7331db2d5b3aa623d5f77546dd416e148fbbc174deeb0c0dcee7566b849' 
  AND token = '9oOoiWCxbhyyZWXgiNXJZgUuzb5YOWwMe9ArtgDqC2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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