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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3da2e357e7fc8767a1a75702f9015c786b6b162d5bbdc6ac59e8d62822293c20' 
  AND token = '1DREFLZdOUz3M97Odod5o2+twqhrKUt/kxhzbWPR5Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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