Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b91d20fd9acbd6c41aa5c888391e95bb5c226979dce0b7d5a9a83e0a59bf2d0' 
  AND token = 'uzvACkAqIvrFzpco5PutGHsvcmC75WlTkSLVNzjrvME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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