Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c1dc8268a44e8bf848d1b909979853c62a4f5a81b04bfe44c0a317fde33dcc' 
  AND token = 'tsMV+pabknzKri3Q9RyGtZQc8sefgdnOO8yuRaIayKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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