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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d9a055b6ae39e87e42198837e21d8c7ff02ccf61c26b90173aaa3bf8634365d' 
  AND token = 'i+v2ybg5bMzLFomXg//bcuSpdreEu2OR0zOlMsSG4js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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