Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec0cee23daab72beece0ba50632d99e11fcd7fbffd762a65fba495275a10779' 
  AND token = 't968f1TmaJ5ZXlxILvemS2o+gf6irwoYEnV1nPruTPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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