Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6794eed081b043865f68312cbf8f6e89b0a4e564e3bd966aaa467291aa691a' 
  AND token = 'Dd3Jm4tDhwRCbLp0ezIktjhs+rs8rbwXYfcoObjKA1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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