Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a801c7783d32a7fe10a3125d82f9e4569832a9b1f9f4f7e9a9e5f6d02da5d2c' 
  AND token = 'eBTtZ4aFqDfyao8e138FMY7BtZTFDtBi/NBzYABTzvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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