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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3fc8a9f03a6b5b201f44eceb3f55a8db2e5f323efd4d482adb32a36b4ec7b87a' 
  AND token = 'KoCmmHzMDzonL+DE7wBqK21pHflv/tulskEdwE1SruI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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