Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c70f772d22b6f718879ba772f5d1b0b918df0c3fa6218b44de2a7ce179bd3c' 
  AND token = 'f0HofnDIiJ4462dEWCTVaj3kIRu7u7J8zEkCuuXERjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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