Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230b070247a08c1074c1b6d6814a29541c2eb5f6703f472547421a4042bcc53c' 
  AND token = 'KTWhDwhK+/Ccg++c/SmNn3VhgKTgiHeELkRHHki2uSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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