SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7c94381e31230fb1e0805cdb83ba4f0c65f847a2474de7fa4e057c4b153d080' 
  AND token = 'z9T5b/BkigJ7sLTVVBbfc8v+w/OsXxw7uuBDsUqVcFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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