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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '81e06bd2dd3b00e211a977f39ebcbf37e569a4714c124c0f76bbf93b5bfdee5c' 
  AND token = 'fKZtu8TP+HE0Pxc66dpJiKMmgwQ1X1/CMKTvrxehVhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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