SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9dda9faa32630b459d18220f0757687ef334461948963d9d62cd5e545ff23b23' 
  AND token = 'HqJBtj5dIHucq+s3X+8UpSnVAPGlv1+8Wqon9qbFoz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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