Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81366a48284982e6160faf0a72e5c390b4446f4d4f96ba5d4470fad4d496b87' 
  AND token = 'FVA7IkmDK1Xl/Qg3JgkAjASTK7RsP0WME5SwoMtITgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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