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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72b8e8edcc8524cac8dd41ca7925c4cf5f350e481c6ee6d680261c1112f5b28f' 
  AND token = 'byG35fnbkv0TXckGUQErsD3/mT1rs54nfTlNE9E7M/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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