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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '272545fa0fea4767a0080023b63c36ccf10abe275fa659b76478346d3556c590' 
  AND token = 'gyJC968oQAAXxQ4NPC6fdn4Zk41ZkkZm58VEt4Tcri4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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