Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf7361a8eab40f4550a242c32cedc1f3c7d6e517f80cc64f9faa513b31112cc' 
  AND token = 'crWLJ++3N0atqiABYXesQAbtgevcuuHMTcjkPdrqNV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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