Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b98625a62432ace4958bb2fb0f898642ba836e78c6e50b8198b0b314756d20' 
  AND token = 'eLME8qeELYKrHn/1QwxMorHQwqgcSJ79ZevS2TjAqNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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