Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d1dbd939a3b48f48597fb59e887220db26fcf718cf27b2fc0422658db2ef6a' 
  AND token = 'CbOXsFEUtpNg24cd9E/s9W0Th/HigM7VRP1wUkHvjVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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