Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d3939821ce6838ea9686b0bd8a46511d761641d3918f8c26d61410f83297c5' 
  AND token = 'yfNqcoVmL03Badtfv6xMI4XpfdhsBH1dOFPsypCaZ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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