Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae885adef93df14e699e91b126391c68e337d076f8a5677cbec8e6013a86da8' 
  AND token = 'XrSaw+rRXal+8veulBu0bQ9E47IP1PwxZruFL8WOFSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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