SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2023bdf1764113b6db831213d8ce40319800e819dbeae8003ec61a53ee487096' 
  AND token = 'YImqNKsBPprI+FG3XZ6ImBQfuoDg+hZ5zj0dR3fDbW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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