Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9844252bdb572cf5a28b502b3b0a9cf95c071210f9a29caf426caddd0c3c18f' 
  AND token = 'T4Z9MoX5OaWc8aE1Ge96MtbIfR7qzDtcUu696tP6wuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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