Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c21acb86c117651b6609bdd5bf1c83fd869f0e0901c6733e2c7931376838b2' 
  AND token = '1ESBKn7f15zUIdswfu1rLXdzKjLDciuEaUON4PrnOGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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