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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '31d43a4cb01a06d9362fe4bce6a93c882dce75d29380d83a94a73c2f7520ee8f' 
  AND token = 'zvFzNRxP+vNri6dnycs/UHKFXo5fwN6LEl9Zd4jiSCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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