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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2beb69348b1a4d5d57b21fd5b837e38aa28294796b68e0fbd2350849cc948b1' 
  AND token = 'xqUAsdACtRdE41A7q8nTSX8nHFchcescGzU6dNHWELs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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