Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9caa5eadb94ad22565dc07a8d76bc3725b2e5ca6859958dc1810d3d1b3ba8d0c' 
  AND token = 'mswhyCUiXCqH9SSGicRiMwOfFlHXUBREm5NtlyKriLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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