Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879f8ac1b3f44b7c2e0e1f687f70bbc24907dc7e88dd7d9416fc96f819164574' 
  AND token = 'KNVbzJ3DxzaY+fP0/CzXorPsS1IYtlVmVnGt0bMrLgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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