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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b8bc0d29e907d9ddb2024c158f720f8196ed1d68df0fde5d059dd67c03c5623' 
  AND token = 'fbyM6bviKUSorkZuRh9pw7uYTcxBqvJTZEJDzAAyxhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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