Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3232d947b7ad45579dad28962e651bbf10c52430d381a5c77084630e2371cce6' 
  AND token = '20aUVFoAjbJUfjI0uxpNb22THAZev5vdEBMEJDjW2xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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