Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389376e55a09f72183f09640d7e7db04c8c574f9045e980961b1ff6d9b8d5f52' 
  AND token = '20ATp+nnvS41RlbyrYlZ4IblhnQrsBDg4VvngGiTaf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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