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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '08093003f0b5cdb450007426f98ee0fa4e693ceb737dd7fd15f109113b7413b3' 
  AND token = 'C0iamf9iYaduH8cf9K9LU/xY36QJNLgtlqj3MS/G/4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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