Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bfa65fd5ed8b6ded81718b3d87e8b4dcb4b85d68b5a216ae5c9283710c95f6' 
  AND token = 'b0mOjNTdPsfY/AC/ga/1uhskweqCVxFFKirEjqgh0vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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