Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4b51422de8d78b98f89f70527fd615308c448549f34d21a945ce73dbeb81f7' 
  AND token = 'MxA8mxwd62QJ5EKlbEbe6bz8H8BHtJJyMsDdrawYQ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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