Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312249e4352f7fb6eae77e5cc2254e61d8de649ab3f7beba6c40b775796e99af' 
  AND token = 'aF9uc2hBx5YeBmtfQ9YMBRqPXaq8+8EPkhRvU0VYTfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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