Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f036b0e728682aaea647f87d4973bac471dbbc549aacda773950df9f40488039' 
  AND token = 'sKMt1HdjewOa06gu0PrErR7qi75/Hmb8JiPyhexwrWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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