Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503c3843c50a505069333d72176cdc9e038098c0902e1e2661e9a7b4f729f701' 
  AND token = 'FywmkIeuc6yv85JP7vV6pJvEcmL795KBuK1k5YpUII8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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