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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2d30eda354b3eb27e51bd9dba8b56829b086750315f3c7e1a69a5dc7c735518c' 
  AND token = 'IEGbcVgxYNTXSe2KtNJxBQmgx0/xbHuJcd69LDPbVj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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