Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7890701586309311aff3d5adfee99e8b8d0879487a4fd78c9a6a9230f01df703' 
  AND token = 'h9Wso2PSd1B83BfqsDAjd2wAhxeJ27VCMTMR/naJIcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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