Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a691e8634166cebc92df4d2dc69422d63aad4439a3fbb5e699a9f8f2355b31cb' 
  AND token = 'lqw0xZgW0otEwLm5EjR+xE05Axdrl9vznL1F//WEDnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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