Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706e5ed0e56e20b7408ecd39a15fa13242b3463fde331b709ff922277d62db93' 
  AND token = 'oVFvVniihf19MOy9pOKZjfLvCWdZov4MPufh+ldTMAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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