Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13eccab4e8d8f995737780162732b84462acd677a570a2e3b90d4eeddda3a89' 
  AND token = 'mQXpDIoYrJTAzy7XeGM7QvAMrYrDD+JCR6LJPCxenFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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