Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '28a55e5ae549b1dddd62806614270f92f45d3dd04bb3d3ca4ffa6bce7d4bfdf3' 
  AND token = '9n2sy2nJ8ql4zV2I2/A/Skgh4QVO8cwQCLalzOsUOO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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