Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275a31917e81d78e8dfc7e292f276e2b6b33e85a2ed8c1894a1bc44a7b9007ec' 
  AND token = '2ObchNo/wMo0RHHtQ9BrkcLN3wWh1exl07On9TIyvKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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