SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07322953dd64d77939ee39e871b26785d691a8a5940477cf247d8504027f64b1' 
  AND token = '3EIiOywU4oD61+lccx+6Xl/YZoDImJarR/DLvBpVJBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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