Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00ae28c481a304706841d39cc915f219068c543d72951d094b5243c469ac2e9' 
  AND token = 'vlh7XHw7WF2PpV42MzKTPrybUgKCxy5O4+HkU8aVolI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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