Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3b5e8baf9d9d43fda17261f5da6fe12f70cfa8bd07b240eb5c57532a2a1af2' 
  AND token = 'TnInjH/O54i5HDf5ARrVFSbfOOI0BQfW1Ts7MD9xMPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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