Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247f09045c580ee6db5bbba6e11d904dba814ef0f9d6127e67d6fab3bc1c6e7f' 
  AND token = 'SJyMr5P/Ymv2zMxhOxlTIEjvU7UMKb/PBiM0x7tqtOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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