Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19015be8f7a09ceae3eb9fccde95ff18ca66213e5fa4c789547fd61ed192dc27' 
  AND token = 'WQl5GDf+5Ean4qLle/tLnj6OTwSfHvBNXQ1pBxjo5qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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