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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa164330ac4620d0991b882d81d283b1a684e9866fd20027f611ec1e711d8d43' 
  AND token = '/xYca+Yc0JYoPhXaGq+MuCRFtCzYQuN6IqVRQ4De8Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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