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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0dd7b1badb3c98475aeb84375c7a9cbb6c7db53aa36af9157a5152486541539a' 
  AND token = 'LS/eBENOBf39uiYe6oBtM/xMs0YVnnX+yTLqQrEydI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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