Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a536cc49c25c99f8abfc412173952f810172af3becae06f327975a591ffb548' 
  AND token = '9eJqxYyJLfVKYO0ilKiVxSEljU3t6x/eAp6iMP8Ogeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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