Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4be433cd329985493a710460edb8f3d9cd2ee6b4a3f089a69a9b90ab326fd9' 
  AND token = 'uEqdP/0Jq7edBb9uXHm7qCQ+jt2PmnLpGaTjG8Bbo+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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