Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99e3e040a91f60a8a80250716ee9a39c472ad8605e1157cd24905c6fab01562' 
  AND token = 'Mdui8fMkks9cAQSqdWqVCtrp2GAXRra95c/mFJvAAjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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