Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a754f14a4e3c793952213a2cbce01832662d1004562bec1e8664d70853b0996c' 
  AND token = 'zP+8jEw12u5239kdwQpyk8oxOUefQKxyddUB5qegWVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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