Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a51838db8ba84c1a07c6021a968333eeb7183d663ae6015af9bf32032067889' 
  AND token = 'vNFXVxyO0UlrzR7lzSlUL00XsqkoKuoy3zv8Onf8+B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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