Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e45b8ba83a99d84ba6da4320d5df753d15026ee9ad6797429985e5fb40ef438' 
  AND token = '0z4DJ+r7zeLvkgI2cyt0G8rDdAuJGrtOWEEirJdYinM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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