Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b98edce0a334b6e9ec37a54f8212285da19ab3d72b42e9c1b1ce2121fb16fd' 
  AND token = 'v8gLlVjjFYFs5yz6Or7Me//FhKy3M5dIxW73f/uWmbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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