Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d115b371a8409ff8667679d5174caa07188d2b55e52e3446f9396cd76ae55a' 
  AND token = '9/8uiZQOijNqW2cdA/uP6YER7D2S4qWIlqC/q/rfaQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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