Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e8863c61898770981f9b6b38bc740e128a8210a12a92a059526769d87c9769' 
  AND token = '+8V5L/vpd9kOWCU96Bep+jqDcbxpQJYDOkmjbOj1TRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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