Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edf15a0c7bf9ad83cb438ff2ceb365d2ebe273f459df62b810a3830833684ab' 
  AND token = '9kvLzpzO6CmjMT0hHzOUujbNhpDxDO8E+UMBVDdfW70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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