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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3690dc604e0480135aaa5118afd2b100e5312e44a6ff673ca0118591a20abcc0' 
  AND token = 'A2eEf/7y7R79I35KkwUXHWa3TOv897GZz/XSPfJgErw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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