Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42124418ed4358c2356d1d353e7597aaad562d3cae7e3d5236d95ab9974accb8' 
  AND token = 'u7rD8nSeuHk5iNj8RfyZWCzRaCt4MtuqozQMJ2D3vwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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