Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9421ba841a086007cf5bd66fc786e4efc0ca34f263a6a26065b0f6483db5431' 
  AND token = 'iE8F+zrIE1lYG+iHnxKNTzkYoyurita3mjZs6yzy1qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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