Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423c8c7b29aa6bd1a3427aadbf71e459c73c4f8f0885f0db1575669d6e46badb' 
  AND token = 'uIF+kFF/C7FC+FCDHy+5bnkQDlW7DXa+dMeeSM0P44o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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