Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc3e461da5afe3fd393d26e2199039e89720caec05014e501e068e634bd548d' 
  AND token = 'p51++UlzffChhQbxmTWXz91MrTiyhLYIgHMsQLnh5Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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