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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d0cb52e56e39b6a671d232a624b0ee34191b3a41a1311f805e003f2feb4fc44' 
  AND token = 'BABAulkglmWhqluzVs9NGb3sSduSgqULBYflu8EoqK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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