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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98417f55e1fd3230e378127405a6650dc535e568db8afa607af73287331180cf' 
  AND token = '3Vk0vcxrkk5c8eZnojLLVknuF8gV1tO7FStxtZxWME8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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